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The park was dirty before but it is clean now.
The trash was everywhere before but it is in the baskets now.
The park was messy before but it is tidy now.
Tony and Gogo were unhappy before but they are happy now.
Let’s pull our trash basket over there.
It’s heavy.
Garbage
Listen! The birds are singing.
Yes, I’m singing too.
Gogo! It was clean. Now it’s dirty here.
Oh, no.
The park was clean before but it is dirty now.
The trash was in the baskets before but it is everywhere now.
The park was tidy before but it is messy now.
Tony and Gogo were happy before but they are unhappy again.
is
are
was
were
1.看时间：过去or现在？
2.看主语：单数or复数？
Miss Lee tidy before but she messy now.
before
now
was
is
before
now
The room
The room clean before.